Artificial tooth



R. J. PARK.

ARTIFIClAL TOOTH.

APPLICATION FILED JAN.10, 192;.

Patented Aug. 9, 1921.

parent assist.

RUSSELI J. PARK, OF ST. LOUIS, MISSOURI.

ARTIFICIAL TOOTH.

Application filed January 10, 1921.

To all whom it may concern:

Be it known that I, RUssnLL J. PARK, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Artificial Teeth, of which the following is aspecification.

This invention relates to new and useful improvements in artificialteeth.

One object of the invention is to provide an artificial tooth so formedat its cervical end that it will be engaged and securely held in placeby the material of the plate to which the tooth is attached.

Another object of the invention is to provide an artificial tooth whosecervical end is so formed that not only will it be readily engaged bythe material of the plate but will form a nice fit therewith so that theteeth may be readily cl ansed and deposits of food or other foreignmatter may be easily removed.

Another object of the invention is to provide an artificial tooth which,in use, will not be liable to be broken loose from the plate but whichwill be securely held thereto without the use of pins or other fasteninmeans.

Vith the above and other objects in view the invention has particularrelation to certain novel features of construction, arrangement of partsand use, an example of which is given in this specification andillustrated in the accompanying drawings, wherein Figure l is a sideview of a plate provided with teeth embodying the invention and shownpartially in section.

Fig. 2 is an anterior view of a front view.

Fig. 3 is a side elevation, and

Fig. & is a rear View.

Referring now more particularly to the drawings, wherein like numeralsof reference designate similar parts in each of the figures, the numeral1 designates a plate which is preferably formed of rubber. It is to beunderstood that the teeth are to be attached to this plate while theplate is in plastic state and before it has hardened. The numeral 2designates a frontal tooth. The cervical end of this tooth is ofconsiderable thickness and is formed with the Specification of LettersPatent.

Patented Aug. 9, 1921.

Serial No. 436,342.

abrupt shoulder 3 substantially at right angles to the line of bite, thefront portion 4; of said cervical end extending upwardly around thelower part of the plate. The cervical end of the tooth, on the sidetoward the plate, has an inward projection 5, which is undercut all theway around so that said projection 5 is dovetailed in form and thisformation provides the abrupt edge 6. The cervical end of the tooth isinserted in the material of the plate when the same is in plastic stateand the material of the plates runs into the undercut groove all the wayaround the projection 5 and abuts against the edge 6, and when thematerial of the plate hardens the tooth is thereby anchored firmly inplace and the edge 6 forms the line of contact for the material of theplate, thus forming a uniform and perfect line of contact and giving a,finished appearance to the plate and eliminating the possibility ofdeposits collecting in between the tooth and plate.

It is obvious that when in use the stress of the bite will be sustainedby the shoulder 23, which, acting in a direct line against the plate,will render it practically impossible to break the anchorage of thetooth to the plate.

What I claim is 2- 1. An artificial tooth whose cervical end is formedwith an abrupt shoulder and an upwardly extending front portion and anundercut projection formed integrally with and following the contour ofthe cervical end of the tooth.

2. A tooth, the posterior end of the cervical end of which is formedwith a projection, said projection being undercut all the way around,forming a groove into which the material of the plate will flow when inplastic state and an abutting shoulder following the contour of saidgroove and forming the outer side thereof, against which the material ofthe plate abuts.

3. An artificial tooth, the posterior side of the cervical end of whichis formed with a shoulder at substantial right angles to the line ofbite, the anterior portion of the tooth being extended up above saidshoulder, the posterior side of said cervical end being also formed Witha projection following the con- In testimony whereof I have signed mytour of said side and being undercut to proname to this specification inthe presence of vide a groove into which the material of tWo subscribingWitnesses. the plate runs When in plastic state, said ma- RUSSELL J.PARK.

5 terial abutting against the front side of the Witnesses:

groove whereby the tooth is securely held in E. V. HARDWAY, positionwhen said material hardens. WM. A. GATHEY.

